Added Cronometer utility class

Runtime/Cronometer.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace KairoEngine.Core
+{
+    public class Cronometer
+    {
+        
+        private float startTime;
+        private float stopTime;
+        private float totalTime;
+        private bool running = false;
+
+        public Cronometer()
+        {
+            startTime = Time.realtimeSinceStartup;
+            running = true;
+        }
+
+        public void Start()
+        {
+            if(!running)
+            {
+                running = true;
+                startTime = Time.realtimeSinceStartup;
+            }
+        }
+
+        public Cronometer Stop()
+        {
+            if(running)
+            {
+                stopTime = Time.realtimeSinceStartup;
+                totalTime += stopTime - startTime;
+                running = false;
+                startTime = 0f;
+                stopTime = 0f;
+            }
+            return this;
+        }
+
+        public void Continue() => Start();
+
+        public float value => totalTime;
+
+        public string Print() => Utilities.TimeToString(value);
+    }
+}

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